145520202122 has 4 divisors (see below), whose sum is σ = 218280303186. Its totient is φ = 72760101060.

The previous prime is 145520202119. The next prime is 145520202137. The reversal of 145520202122 is 221202025541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129737556481 + 15782645641 = 360191^2 + 125629^2 .

It is a super-2 number, since 2×145520202122² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145520202091 and 145520202100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36380050529 + ... + 36380050532.

Almost surely, 2^145520202122 is an apocalyptic number.

145520202122 is a deficient number, since it is larger than the sum of its proper divisors (72760101064).

145520202122 is an equidigital number, since it uses as much as digits as its factorization.

145520202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72760101063.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 145520202122 its reverse (221202025541), we get a palindrome (366722227663).

The spelling of 145520202122 in words is "one hundred forty-five billion, five hundred twenty million, two hundred two thousand, one hundred twenty-two".